Characteristics of polyelectrolyte multilayers: Effect of PEI anchoring layer and posttreatment after deposition

Kolasińska, Marta; Krastev, Rumen; Warszyński, Piotr

doi:10.1016/j.jcis.2006.09.035

Cited by 124 publications

(138 citation statements)

References 37 publications

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“…The increase of the thickness for the film with up to 4-6 layers is smaller than for one with larger number of layers already deposited. It is a common feature observed during formation of polyelectrolyte films, connected with the build-up of precursor layers of the film, which are adjacent to the silicon surface (Buron et al 2006;Kolasińska et al 2007). For some conditions of the film formation one can also observe non-monotonous growth of its thickness with the number of deposited layer.…”

Section: Resultsmentioning

confidence: 99%

Formation and stability of poly-L-lysine/casein multilayers

Szyk-Warszyńska¹,

Piekoszewska²,

Warszyński³

2010

Adsorption

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The aim of our work was to investigate formation of multilayer films containing biocompatible polycation poly-L-lysine (PLL) and α-or β-casein. Since in the neutral pH casein is negatively charged, it has been used as a polyanionic layer for the film build-up. Casein containing films were formed at surface of Si/SiO 2 wafers and their thickness was measured by ellipsometry. The effect of ionic strength of PLL and casein solutions was investigated. After the multilayer films were formed, they were contacted with solutions having various pH and salts to determine film stability under these conditions. Additionally the response of the thickness of PLL/casein films to the temperature variation in the range of 5-45°C was also analyzed. Formation and stability of casein containing films was also investigated on surfaces of titanium and stainless steel. We used fluorescently labeled protein to monitor the amount of casein in the film and its change after treatment with solutions containing calcium ions.

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Section: Resultsmentioning

confidence: 99%

Formation and stability of poly-L-lysine/casein multilayers

Szyk-Warszyńska¹,

Piekoszewska²,

Warszyński³

2010

Adsorption

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“…The initial layer of PEI was applied onto a bare gold electrode surface, serving as an anchor for subsequent polyelectrolytes adsorption [55]. Poly(ethylene imine) is a weak polybase, commonly used as an adhesion promoter in order to achieve a positively charged substrate with an even coating, and to minimise an influence of the surface on the growth of consecutive layers [56].…”

Section: Polyelectrolyte Multilayer Formationmentioning

confidence: 99%

Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Haberska

Ruzgas

2009

Bioelectrochemistry

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Polyelectrolyte multilayer films adsorbed on gold surfaces were studied by combined ellipsometric and electrochemical methods. Multilayers were composed of "synthetic" (poly(4-styrenesulfonic acid) ammonium salt (PSS) and poly(allylamine hydrochloride) (PAH) (PSS/PAH)) and "semi-natural" (carboxymethyl cellulose (CMC) and chitosan (CHI) (CMC/CHI)) polyelectrolytes. It was found that only PSS/PAH Layer-by-Layer (LbL) assembled structures result in dense surface confined films that limit permeability of small molecules, such as ferri-/ferrocyanide. The PSS/PAH assemblies can be envisaged as films with pinholes, through which small molecules diffuse. During the LbL deposition process of these films a number of pinholes quickly decay. A representative pinhole diameter was found to be approximately 20 μm, which determines the diffusion of small molecules through LbL films, and yet remains constant when the film consists of a few LbL assembled polyelectrolyte bilayers. CMC/CHI LbL assemblies at gold electrode surfaces give very low density films, which do not limit the diffusion of ferri-/ferrocyanide between the surface of the electrode and the solution.

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“…To increase the efficiency of the polyelectrolyte film formation and to decrease the film roughness, we used polyethyleneimine to create the first polymer layer [23,24]. PAH and Fe 3 O 4 nanoparticles were alternatively deposited onto silicon wafers in a com puter assisted Poliion 1M device (Saratov, Russia) [18].…”

Section: Methodsmentioning

confidence: 99%

Surface morphology and optical and magnetic properties of polyelectrolyte/magnetite nanoparticles nanofilms

Gorin¹,

Yashchenok²,

Koksharov

et al. 2009

Tech. Phys.

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Abstract-Polyelectrolyte/iron oxide nanoparticles composite nanocoatings are fabricated by polyionic assembly. They are characterized by atomic force microscopy, electron magnetic resonance, ellipsometry, and secondary ion mass spectrometry. The results obtained indicate that the number of magnetite nanoparticle lay ers in a film is related to its refractive index, thickness, and surface roughness. The electron magnetic resonance signal intensity is found to nonlinearly depend on the number of magnetic nanoparticle layers in a film.

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Characteristics of polyelectrolyte multilayers: Effect of PEI anchoring layer and posttreatment after deposition

Cited by 124 publications

References 37 publications

Formation and stability of poly-L-lysine/casein multilayers

Formation and stability of poly-L-lysine/casein multilayers

Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Surface morphology and optical and magnetic properties of polyelectrolyte/magnetite nanoparticles nanofilms

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